I know a steward who won a large grievance and gave it to a driver who had a terminal illness. He spent his own time researching and sitting thru hearings, which was not compensated, and then gave that all away to help someone in great need.
I know another steward that took the heat while exposing seriously crazy management behavior against the drivers (the drivers were filing and making phone calls over the abuse) and when the management was finally removed and the company brought in a hard butt hatchet man some of the drivers turned on the steward who had stood up for them at the risk of his own job.
Its pretty much a thankless job...
unless you like pain and mental stress.